Direct Synthesis of Nickel(II) Tetraphenylporphyrin and Its Interaction with a Au(111) Surface: A Comprehensive Study

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• 作者：Min Chen ; Xuefei Feng ; Liang Zhang ; Huanxin Ju ; Qian Xu ; Junfa Zhu ; J. Michael Gottfried ; Kurash Ibrahim ; Haijie Qian ; Jiaou Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：June 3, 2010
• 年：2010
• 卷：114
• 期：21
• 页码：9908-9916
• 全文大小：376K
• 年卷期：v.114,no.21(June 3, 2010)
• ISSN：1932-7455

文摘

Tetraphenylporphyrin (2HTPP) molecules were vapor-deposited onto a gold(111) surface to serve as reactive ligands for the direct synthesis of nickel(II) tetraphenylporphyrin (NiTPP) under ultrahigh vacuum (UHV) conditions. The surface-confined coordination reaction between a 2HTPP monolayer and coadsorbed Ni as well as the structure of 2HTPP multilayer films on Au(111) was characterized in detail using synchrotron radiation photoelectron spectroscopy (SRPES), X-ray photoelectron spectroscopy (XPS), and near-edge X-ray absorption fine structure spectroscopy (NEXAFS). It is shown that the vapor-deposited 2HTPP multilayer on Au(111) has a high degree of ordering with a preferential orientation of the molecular plane relative to the substrate. Monolayers of 2HTPP on Au(111) were obtained by annealing the 2HTPP multilayers to 520 K and were found to be thermally stable up to at least 580 K. NiTPP can be synthesized directly on the Au(111) surface through reaction of the 2HTPP monolayer with postadsorbed Ni atoms. The same reaction occurs if Ni is deposited prior to the deposition of 2HTPP. It is proposed that the complete and uniform metalation of the porphyrin layer is possible because the Ni atoms can diffuse easily on the porphyrin-covered surface. Ni 2p XP spectra of NiTPP monolayers indicate that the electronic interaction between the coordinated Ni ion and the Au substrate is weak.